CN101081349A - Fire-coal hot blast desulfurizing system - Google Patents
Fire-coal hot blast desulfurizing system Download PDFInfo
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- CN101081349A CN101081349A CN 200710062268 CN200710062268A CN101081349A CN 101081349 A CN101081349 A CN 101081349A CN 200710062268 CN200710062268 CN 200710062268 CN 200710062268 A CN200710062268 A CN 200710062268A CN 101081349 A CN101081349 A CN 101081349A
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Abstract
The coal burning and hot blast desulfurizing system consists of a coal burning boiler, a dedusting mechanism, an air feeding mechanism and a pressure calcium spraying mechanism comprising a lime bin and a jet pump. It features that the pressure calcium spraying mechanism has pressure originated from the air feeding pipeline, and that in the air feeding pipeline, air is first heated in one air preheating heat exchanger connected to the fume pipeline of the coal burning boiler, and then fed to the combustor of the coal burning boiler and the lime jetting pump, so as to spray lime powder to inside the boiler. The present invention has low cost, high reliability and other advantages.
Description
Technical field
The present invention relates to a kind of fire-coal hot blast desulfurizing system, especially the desulphurization system of coal-fired boiler in power plant belongs to the boiler flue gas purification processing technology field.
Background technology
The coal-fired plant flue gas sulfur removal technology is existing a lot of both at home and abroad, in dry desulfurizing process, using more is flue gas circulating fluidized bed technology, it is to allow flue gas form turbulent flow in the absorption tower, make the abundant haptoreaction of sulfur dioxide in flue gas and absorbent, reach higher desulfuration efficiency, but complex process, systems bulky, floor space is many.The unit of particularly not reserving the desulfurization place is difficult to promote.The flue gas dry desulfurizing technology of the static spray calcium of present domestic employing, it is simple to have technology, the characteristics that floor space is few, but desulfuration efficiency is lower, and its subject matter is not utilize the existing equipment of boiler, but establish the independent dedicated system of a cover in addition, for example the conveying wind of dry method desulfuration system use is the roots blower from special use, and the fluidized wind in grey storehouse is from the fluidisation blower fan of special use, special-purpose electric heater is then given these wind heating, purchases these highly energy-consuming equipment and has also increased the purification cost.These condition boilers all possess itself in fact, and some has all wasted, and for example the exhaust emissions temperature of boiler reaches 200 ℃, all emitted, and the fluidized wind of desulphurization system also will heat in addition with electric heater.
Summary of the invention
One of purpose of the present invention is to provide a kind of coal hot-air desulfurization to be, utilizes the heat of boiler exhaust gas and the pressure of boiler fan that desulfurizing agent is directly sprayed in the stove, finishes desulphurization reaction in burner hearth.
Technical scheme of the present invention is achieved in that this fire-coal hot blast desulfurizing system, by coal-burning boiler, wind pushing mechanism and pressure spray calcium mechanism form, pressure spray calcium mechanism comprises pulverized limestone feed bin, jet pump, it is characterized in that: the expulsion pressure that described pressure sprays calcium mechanism is the air-supply pipeline of shunting from boiler fan, the air-supply pipeline of boiler fan is the air preheat interchanger heating by connecting on the fire coal boiler fume pipeline at first, again respectively to the combustion chamber and the lime injection pumping wind of coal-burning boiler, with lime injection in boiler furnace.
Described fire-coal hot blast desulfurizing system, described pressure spray calcium hot blast temperature is 150-200 ℃, mixes two streams of formation dilute phase gas-solid with pulverized limestone through jet pump, sprays in the stove with the speed of 13-18 meter per second.
Described fire-coal hot blast desulfurizing system, the total amount of described pressure spray calcium is corresponding with coal-fired sulfur content, finishes desulphurization reaction in burner hearth 800-1200 ℃ zone.
Described fire-coal hot blast desulfurizing system is characterized in that: the air-supply pipeline of described boiler fan (7) is also shunted a part of hot blast and is provided fluidized wind to the pulverized limestone feed bin.
The technical solution used in the present invention is the desulfurization new technology at the suitable China's national situation of China mountain area, the exploitation of the near coal-mine power plant of upper level.This technology has made full use of the boiler existing equipment, has avoided overlapping investment, because spray calcium itself is hot blast, has saved electric heater again.Invest little, instant effect, it has only 1/2～1/3 of wet type desulfurizing investment, and advantage such as regular maintenance is simple, and is reliable, is middle-size and small-size power plant preferred manner.Owing to cancelled equipment such as roots blower, the mechanical, electrical heater of fluidized wind, made the desulphurization system construction cost reduce by 40%.Because the minimizing of equipment has also reduced the day-to-day operation maintenance cost significantly, has improved reliability.This system also can utilize the DCS control system of boiler, when furnace temperature this system's automatic charging operation during at 800-850 ℃, in addition since the stone flour particle go into the stokehold and carried out preheating, make calcium oxide quicken to form, improve the efficient of desulfurizing agent, reduced the flow-disturbing that the normal temperature delivery air in the conventional desulfurization brings for the boiler emulsion zone.Hot blast carries stone flour also to help to dry stone flour, makes to carry the unimpeded caking plugging that is not easy to produce.
Desulphurization system of the present invention does not increase power consumption basically, and the equipment of unique electricity consumption is accent amount batcher, also has only 500-1KW.Except that having saved construction cost and maintenance cost, the annual electric power of saving also is considerable.For example use conventional desulfurization method, a 125t/h CFBB separate unit is pressed 80KW/h (sieve time blower fan 50KW, fluidisation blower fan 10KW, electric heater 20KW) calculate power consumption every day: 1920 degree/single stoves, the electric price of every degree is by 0.3 yuan, and year/separate unit stove is saved the electricity charge and just reached more than 200,000 yuan.
Description of drawings
Fig. 1 is a fire-coal hot blast desulfurizing system schematic diagram of the present invention
Among the figure: 1, coal-burning boiler 2, air preheat interchanger 3, deduster 4, pulverized limestone feed bin 5, pressure maintaining valve 6, jet pump 7, blower fan 8, flow divider
The specific embodiment
A hot blast the present invention shown in Figure 1 utilizes air preheat interchanger 2 on coal-burning boiler (CFBB) 1 flue gas flow channel after is drawn a very little part, boiler fan 7 is respectively to the combustion chamber and the lime injection pumping wind of coal-burning boiler, mix with agstone through jet pump 6, form the dilute phase Dual-Phrase Distribution of Gas olid, spray in the stove with 15 meter per second speed, therefore be called " pressure spray calcium ", the total amount that sprays into calcium is corresponding with coal-fired sulfur content, and it is as follows to finish desulphurization reaction in burner hearth 800-1200 ℃ zone:
CaCO
3→CaO+CO
2
SO
2+1/2O
2→SO
3
Ca+SO
2+1/2O
2→CaSO
4
The main innovate point of fire-coal hot blast desulfurizing system of the present invention is to utilize original boiler fan 7, in air-supply flow divider 8 is set on the pipeline and tells a part of hot blast and provide pressure to jet pump, has saved the very big special-purpose roots blower of power.Because from air preheat interchanger 2 itself is exactly hot blast, not only saved electric heater, also since the stone flour particle go into the stokehold and carried out 150-200 ℃ preheating, make calcium oxide quicken to form, improve the efficient of desulfurizing agent, reduced the flow-disturbing that the normal temperature delivery air in the conventional desulfurization brings for the boiler emulsion zone.Elongation technology scheme of the present invention comprises that also hot blast is introduced 4 pairs of powders of pulverized limestone feed bin carries out fluidisation, utilizes hot blast to carry stone flour also to help to dry material, makes to carry the unimpeded caking plugging that is not easy to produce.
Fire-coal hot blast desulfurizing system of the present invention is suitable for CFBB, desulfurizing agent is mainly selected agstone, desulfuration efficiency is generally about 95%, this mode is invested little, instant effect, cost have only 1/2～1/3 of wet type desulfurizing investment, and it is simple to have regular maintenance, advantage such as reliable is a middle-size and small-size power plant preferred manner.Because desulphurization system has been cancelled equipment such as roots blower, the mechanical, electrical heater of fluidized wind, make system's construction cost reduce by 40%.Because the minimizing of equipment has also reduced the day-to-day operation maintenance cost significantly, has improved reliability.This system also can utilize the DCS control system of boiler, when furnace temperature this system's automatic charging operation during at 800-850 ℃.
Fire-coal hot blast desulfurizing system of the present invention is in the test of laboratory simulation field trial, and desulfuration efficiency reaches 96.6%, amount of sulfur contenting in smoke: SO before handling
2=7000mg/m
3, handle back amount of sulfur contenting in smoke: SO
2=238mg/m
3, handle the 1200mg/m of back amount of sulfur contenting in smoke " the air pollution emission standard GB13223-1996 of the thermal power plant " defined that was far smaller than State Bureau of Environmental Protection 96 years
3Standard.Minimum through test and this desulfurization of calculating proof hot-air system to the boiler influence, because shunt away wind of sub-fraction boiler of desulphurization system, only be equivalent to 1/30 of total blast volume, this air quantity at last with get back in the stove again after agstone mixes, so advancing the total blast volume of stove does not reduce, only the fluidisation air quantity from siege reduces to some extent, can ignore or a big a little wind flow gets final product.
Foregoing description only proposes as several enforceable technical scheme of fire-coal hot blast desulfurizing system of the present invention, not as it is specifically installed or the technology limitation condition.
Claims (4)
1, a kind of fire-coal hot blast desulfurizing system, by coal-burning boiler, wind pushing mechanism and pressure spray calcium mechanism form, pressure spray calcium mechanism comprises pulverized limestone feed bin (4), jet pump (6), it is characterized in that: the expulsion pressure that described pressure sprays calcium mechanism is the air-supply pipeline of shunting from boiler fan (7), the air-supply pipeline of boiler fan is air preheat interchanger (2) heating by connecting on the fire coal boiler fume pipeline at first, again respectively to the combustion chamber and the lime injection pumping wind of coal-burning boiler, with lime injection in boiler furnace.
2, according to the described fire-coal hot blast desulfurizing system of claim 1, it is characterized in that: described pressure spray calcium hot blast temperature is 150-200 ℃, mixes two streams of formation dilute phase gas-solid with pulverized limestone through jet pump, sprays in the stove with the speed of 13-18 meter per second.
3, according to claim 1 or 2 described fire-coal hot blast desulfurizing systems, it is characterized in that: the total amount of described pressure spray calcium is corresponding with coal-fired sulfur content, finishes desulphurization reaction in burner hearth 800-1200 ℃ zone.
4, according to the described fire-coal hot blast desulfurizing system of claim 1, it is characterized in that: the air-supply pipeline of described boiler fan (7) is also shunted a part of hot blast and is provided fluidized wind to the pulverized limestone feed bin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710062268 CN101081349A (en) | 2007-07-09 | 2007-07-09 | Fire-coal hot blast desulfurizing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710062268 CN101081349A (en) | 2007-07-09 | 2007-07-09 | Fire-coal hot blast desulfurizing system |
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| CN101081349A true CN101081349A (en) | 2007-12-05 |
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|---|---|---|---|
| CN 200710062268 Pending CN101081349A (en) | 2007-07-09 | 2007-07-09 | Fire-coal hot blast desulfurizing system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706247A (en) * | 2013-12-13 | 2014-04-09 | 山西蓝天环保设备有限公司 | Circulation fluidized bed boiler desulphurization method |
| CN104896494A (en) * | 2015-06-19 | 2015-09-09 | 山西大学 | Afterheat recovery device applied to dry desulfurization technology |
| CN107543167A (en) * | 2017-09-30 | 2018-01-05 | 南京工业职业技术学院 | Clinical waste dechlorination desulfurizer |
-
2007
- 2007-07-09 CN CN 200710062268 patent/CN101081349A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706247A (en) * | 2013-12-13 | 2014-04-09 | 山西蓝天环保设备有限公司 | Circulation fluidized bed boiler desulphurization method |
| CN104896494A (en) * | 2015-06-19 | 2015-09-09 | 山西大学 | Afterheat recovery device applied to dry desulfurization technology |
| CN107543167A (en) * | 2017-09-30 | 2018-01-05 | 南京工业职业技术学院 | Clinical waste dechlorination desulfurizer |
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